Cylinder boring tool



May 23, 1933.

A. C. TOSKE CYLINDER BORING TOOL Filed April. 29. 1932 v 2 Sheets-Sheet 1 Patented May 23, 1933 i i UNITED STATES anama emen; trosigaor mcii siw m, mommy CYLINDER s nsations Applieat ion filedhpril as, 1932. Serial No. 608,287.

Theipresent invention has for anobject the provision of a hand-operated tool Iwherebythe unworn end portion of the cylinderwall canbe bored so as to make the diameter of the cylinderaopening uniform 1 throughout thelength thereof. 1

It'isanother object to provide a simple,

conipact,'and eliicient tool of this character which can be ad]usted readily to the inter- With the foregoing and other objects in view which Will appear as the description proceeds, the invention resldes 1n the combination and arrangement of parts and in the details of construction hereinafter described and claimed it being understood that changes in the preclse embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings the preferred form oi the invention has been shown.

In said drawings:

Figure 1 is a plan view of a portionof a cylinder block showing the tool supported in the open end of the cylinder to be bored.

Figure 2 is a transverse sectionthrough the cylinder looking toward the tool, a por tion of the tool being broken away.

Figure 3 is a side elevation 01": the tool.

Figure 4 is an elevation showing theop- J posite side thereof, the tool being positioned in a cylinder ready for use.

Figure 5 is another elevation of the tool viewed substantially at right angles to Figure 4.

and itsbinding means. i 1 i nal diameter of the cylinder to'be treated.

radially fromthe body 11 above the projectstud and is adapted to bind on the body nally.

r s diverge from each otherand from the pas Figure 6 1s a section through the tool online 66, Figure 1, the bit and fits adustmg screw being shown in elevation.

F igure? is an elevation of a guide leg Referring to the figures byjcharacters ofr 5 rcference, .1 designates the body of alblo ck preferably partly cylindrical and having a flat peripheral portion 2. Formed on this body adjacent to the center thereof is hub Shaving an angular, socket 4 adaptedto 1. receive a wrench 5 Wherebythe entire tool can berotated bodily by hand.

An opening 6 extends downwardly through the body from the bottom ofjthe socket and is in communication with anan- 5 gular passage 1 7 opening. through the. periphery of body lvat a point opposite the center of the fiat surface 2. In this passage is slidably mounted? a cuttingtool in the form of abit 8 the inner endof whichis1 engaged by one end of an adjustingscrew 9which is screwed into-the body 1 andwextends perpendicularly from the flat surface 2. By means ofthis screw the cutting edge of the bit 8 can be projected any desired (5 distance beyond the i peripherywof body l so as to cut to the desired depth; 1 i 1 A supporting tongue or guide 10 extends ing end ofthe tool 8 and is adapted to resti on the cylinder block B when the tool is properlypositioned in cylinder (1.

Another passage 11 formed in the body 1 and opens through the periphery thereof adjacent to and inadvance of the d tool 8. Inxthis passageis slidablymounh ed a guide leg12 having a smalhroller13 at its outer end adapted to travel along the inner surface of the wall of cylinder C infiadvance 0 h Cutting edg of Cutter 8. "This leg. has a threaded. stud 14: projecting therefrom throiigh aslot 15 formed in body 1 and a'clamplng nut 16 engages the so as tohol d the leg against sliding movement after ithas beenadjusted longitudi- Passages 17 formed in the body 1 and sage these passages 17 being dis-.

posed substantially at angles of 120 to each A bolt 21 is detachably mounted in the.

outer end portion of each leg 18 and mount- 1 ed on each bolt below leg 18 is a guide roller der. as to wedge between body 1 and the bolts the cylindersbelow the shoulder S. eccentrics are then secured by pins 25.

22 for rolling contact with the inner surface of cylinder C below the point where the cylinder is to be bored.

Mounted on each bolt 21 above leg 18 is an adjusting eccentric 23 providing aseries of openings 24 concentric with bolt 21. Any one of these openings 24 is adapted to receive a locking pin 25 which is also insertible into an opening 26 in leg18. Obviously by removing pin 25 and rotating the eccentric 23 in a clockwise direction, as in Figure 1, the leg 18 will be forced outwardly relative to body 1 a desired distance after which pin 25 can be reinserted to hold the parts against retrograde movement.

It can be assumed that the cylinder C has become so worn that an annular interior shoulder. S has been formed therein, near one end. For the purpose of boring this end portion of the cylinder so as to obliterate the shoulder, the tool constituting the present invention is inserted into the cylin- The eccentrics 23 are then rotated so 21 and shift the rollers 22 outwardly against These Thereafter leg 12 and roller 13 are adjusted against the surface to be cut. Thus the tool will be held in the cylinder and will be supported on the block B by tongue 10 and those portions of the eccentrics lapping the block. The cutting bit is then adjusted longitudinally by screw 9until its cutting edge bites into thevwall of the cylinder. As this edge is of a length equal to or greater than that of the surface to be bored, it will be apparent that when the-tool is rotated by means of wrench 5 the cutting edge of the bityvill plow through the surface portion of the cylinder. The cutting'bit can be fed outwardly as required so that ultimately the shoulder S will be obliterated and the cylinder will be of the same bore throughout its length. The leg 12 and the roller 13 will also be adjusted outwardly as needed to maintain proper cooperation of the bit with the wall of the cylinder.

Obviously the sizes of the rollers can be varied and the proportions of the other vparts canalso be changed to meet the requirements of cylinders ofvdifferent sizes.

What is claimed is: 1. toolfor boring the end portion of a cylinder, including a body, a cutting bit adjustably carried by and rojecting from the body for engagement with the cylinder area to be cut, means adjustably connected to the body and support in advance of the bit for movable contact with the area of the cylinder to be cut, legs slidably connected to the body, means carried thereby for movable contact with the cylinder outside the area to be cut, and adjusting means cooperating with the body and carried by the legs for direct engagement with the cylinder to support the tool within the cylinder and for adjusting the legs relative to the body.

2. A tool forboring the end portion of a cylinder, including a body, a cutting bit adjustably carried by and projecting from the body for engagement with the cylinder area to be cut, means adjustably connected to the body and support in advance of the bit for movable contact with the area of the cylinder to be cut, legs slidably connected to the body, means carried thereby for movable contact with the cylinder outside the area to be cut, and means (:00 aerating with the body and carried by the legs for adjusting said legs relative to the body and supporting the tool within the cylinder, said means including an eccentric rotatably mounted on each leg and bearing against the body, and means cooperating with the eccentric andits leg for holding the eccentric against rotation,

In testimony. that I claim the foregoing as my own, I have hereto ailixed my signature.

ARTHUR C. TOSKE. 

